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    ASTM D648 - 16

    Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position

    Active Standard ASTM D648 | Developed by Subcommittee: D20.30

    Book of Standards Volume: 08.01


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    Significance and Use

    5.1 This test is particularly suited to control and development work. Data obtained by this test method shall not be used to predict the behavior of plastic materials at elevated temperatures except in applications in which the factors of time, temperature, method of loading, and fiber stress are similar to those specified in this test method. The data are not intended for use in design or predicting endurance at elevated temperatures.

    5.2 For many materials, there may be a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Refer to Table 1 in Classification D4000, which lists the ASTM material standards that currently exist.

    1. Scope

    1.1 This test method covers the determination of the temperature at which an arbitrary deformation occurs when specimens are subjected to an arbitrary set of testing conditions.

    1.2 This test method applies to molded and sheet materials available in thicknesses of 3 mm (1/8 in.) or greater and which are rigid or semirigid at normal temperature.

    Note 1: Sheet stock less than 3 mm (0.125 in.) but more than 1 mm (0.040 in.) in thickness may be tested by use of a composite sample having a minimum thickness of 3 mm. The laminae must be of uniform stress distribution. One type of composite specimen has been prepared by cementing the ends of the laminae together and then smoothing the edges with sandpaper. The direction of loading shall be perpendicular to the edges of the individual laminae.

    1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

    1.4 Some older machines still use mercury-in-glass thermometers. (Warning—Mercury has been designated by many regulatory agencies as a hazardous material that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.

    1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    Note 2: The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

    Note 3: This standard and ISO 75-1 and ISO 75-2 address the same subject matter, but differ in technical content, and results shall not be compared between the two test methods.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D618 Practice for Conditioning Plastics for Testing

    D883 Terminology Relating to Plastics

    D1898 Practice for Sampling of Plastics

    D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens

    E1 Specification for ASTM Liquid-in-Glass Thermometers

    E77 Test Method for Inspection and Verification of Thermometers

    E608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1137/E1137M Specification for Industrial Platinum Resistance Thermometers

    NIST Document

    NBS Special Publication 250-22

    ISO Standards

    ISO 75-2 Plastics--Determination of Temperature of Deflection Under Load--Part 2: Plastics and Ebonite


    UNSPSC Code

    UNSPSC Code 13100000(Rubber and elastomers)


    Referencing This Standard

    DOI: 10.1520/D0648-16

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D648-16, Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position, ASTM International, West Conshohocken, PA, 2016, www.astm.org

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